About RadCaptcha for ASP.NET AJAX

It is so easy to prevent your online forms from automated spam by simply adding
RadCaptcha to your ASP.NET application. A flexible website security component, RadCaptcha
will protect your registration, comment, poll, content submission, etc. It generates
distorted images of letters and numbers that are easily decipherable to humans --
but not to spam bots. In essence, it allows you to focus on your code or content
-- instead of on deleting spam.

RadCaptcha and 80+ other controls are part of UI for ASP.NET AJAX, a comprehensive toolset taking
care of the common functionality of your application, while leaving you with more
time to work on its business logic.

Key Features

Three Modes for Protection - you can easily define which strategies to be used for
spam protection

Set Custom Error Message - the error message that is displayed when the condition
being validated fails

Background and Line Noise Level of the Captcha Image - you can easily control the
background and the line noise of the Image by setting the respective value (None,
Low, Medium, High or Extreme)

Font Family and Font Warp of the Captcha Image - you can easily choose which font
family to be used for the Image text

Text Length and Possible Characters of the Captcha Image - the default length of
the text is 5 characters, and the characters could be either letters or either numeric
characters

Maximum Time Interval of the Captcha Image - the maximum number of minutes the Captcha
Image will be cached and valid

Minimum Timeout - minimum number of seconds the form must be displayed before it
is valid. If you're too fast, you must be a robot